/* SDSLib, A C dynamic strings library
 *
 * Copyright (c) 2006-2010, Salvatore Sanfilippo <antirez at gmail dot com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *   * Neither the name of Redis nor the names of its contributors may be used
 *     to endorse or promote products derived from this software without
 *     specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#define SDS_ABORT_ON_OOM

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "sds.h"
#include <stdarg.h>

static void sdsOomAbort(void) {
	fprintf(stderr, "SDS: Out Of Memory (SDS_ABORT_ON_OOM defined)\n");
	abort();
}

sds sdsnewlen(const void *init, size_t initlen) {
	struct sdshdr *sh;

	sh = malloc(sizeof(struct sdshdr) + initlen + 1);
#ifdef SDS_ABORT_ON_OOM
	if (sh == NULL) sdsOomAbort();
#else
	if (sh == NULL) return NULL;
#endif
	sh->len = initlen;
	sh->free = 0;
	if (initlen) {
		if (init) memcpy(sh->buf, init, initlen);
		else memset(sh->buf, 0, initlen);
	}
	sh->buf[initlen] = '\0';
	return (char*)sh->buf;
}

sds sdsempty(void) {
	return sdsnewlen("", 0);
}

sds sdsnew(const char *init) {
	size_t initlen = (init == NULL) ? 0 : strlen(init);
	return sdsnewlen(init, initlen);
}

sds sdsdup(const sds s) {
	return sdsnewlen(s, sdslen(s));
}

void sdsfree(sds s) {
	if (s == NULL) return;
	free(s - sizeof(struct sdshdr));
}

void sdsupdatelen(sds s) {
	struct sdshdr *sh = (void*)(s - (sizeof(struct sdshdr)));
	int reallen = strlen(s);
	sh->free += (sh->len - reallen);
	sh->len = reallen;
}

static sds sdsMakeRoomFor(sds s, size_t addlen) {
	struct sdshdr *sh, *newsh;
	size_t free = sdsavail(s);
	size_t len, newlen;

	if (free >= addlen) return s;
	len = sdslen(s);
	sh = (void*)(s - (sizeof(struct sdshdr)));
	newlen = (len + addlen) * 2;
	newsh = realloc(sh, sizeof(struct sdshdr) + newlen + 1);
#ifdef SDS_ABORT_ON_OOM
	if (newsh == NULL) sdsOomAbort();
#else
	if (newsh == NULL) return NULL;
#endif

	newsh->free = newlen - len;
	return newsh->buf;
}

/* Grow the sds to have the specified length. Bytes that were not part of
 * the original length of the sds will be set to zero. */
sds sdsgrowzero(sds s, size_t len) {
	struct sdshdr *sh = (void*)(s - (sizeof(struct sdshdr)));
	size_t totlen, curlen = sh->len;

	if (len <= curlen) return s;
	s = sdsMakeRoomFor(s, len - curlen);
	if (s == NULL) return NULL;

	/* Make sure added region doesn't contain garbage */
	sh = (void*)(s - (sizeof(struct sdshdr)));
	memset(s + curlen, 0, (len - curlen + 1)); /* also set trailing \0 byte */
	totlen = sh->len + sh->free;
	sh->len = len;
	sh->free = totlen - sh->len;
	return s;
}

sds sdscatlen(sds s, const void *t, size_t len) {
	struct sdshdr *sh;
	size_t curlen = sdslen(s);

	s = sdsMakeRoomFor(s, len);
	if (s == NULL) return NULL;
	sh = (void*)(s - (sizeof(struct sdshdr)));
	memcpy(s + curlen, t, len);
	sh->len = curlen + len;
	sh->free = sh->free - len;
	s[curlen + len] = '\0';
	return s;
}

sds sdscat(sds s, const char *t) {
	return sdscatlen(s, t, strlen(t));
}

sds sdscpylen(sds s, char *t, size_t len) {
	struct sdshdr *sh = (void*)(s - (sizeof(struct sdshdr)));
	size_t totlen = sh->free + sh->len;

	if (totlen < len) {
		s = sdsMakeRoomFor(s, len - sh->len);
		if (s == NULL) return NULL;
		sh = (void*)(s - (sizeof(struct sdshdr)));
		totlen = sh->free + sh->len;
	}
	memcpy(s, t, len);
	s[len] = '\0';
	sh->len = len;
	sh->free = totlen - len;
	return s;
}

sds sdscpy(sds s, char *t) {
	return sdscpylen(s, t, strlen(t));
}

sds sdscatvprintf(sds s, const char *fmt, va_list ap) {
	va_list cpy;
	char *buf, *t;
	size_t buflen = 16;

	while (1) {
		buf = malloc(buflen);
#ifdef SDS_ABORT_ON_OOM
		if (buf == NULL) sdsOomAbort();
#else
		if (buf == NULL) return NULL;
#endif
		buf[buflen - 2] = '\0';
		va_copy(cpy, ap);
		vsnprintf(buf, buflen, fmt, cpy);
		if (buf[buflen - 2] != '\0') {
			free(buf);
			buflen *= 2;
			continue;
		}
		break;
	}
	t = sdscat(s, buf);
	free(buf);
	return t;
}

sds sdscatprintf(sds s, const char *fmt, ...) {
	va_list ap;
	char *t;
	va_start(ap, fmt);
	t = sdscatvprintf(s, fmt, ap);
	va_end(ap);
	return t;
}

sds sdstrim(sds s, const char *cset) {
	struct sdshdr *sh = (void*)(s - (sizeof(struct sdshdr)));
	char *start, *end, *sp, *ep;
	size_t len;

	sp = start = s;
	ep = end = s + sdslen(s) - 1;
	while (sp <= end && strchr(cset, *sp)) sp++;
	while (ep > start && strchr(cset, *ep)) ep--;
	len = (sp > ep) ? 0 : ((ep - sp) + 1);
	if (sh->buf != sp) memmove(sh->buf, sp, len);
	sh->buf[len] = '\0';
	sh->free = sh->free + (sh->len - len);
	sh->len = len;
	return s;
}

sds sdsrange(sds s, int start, int end) {
	struct sdshdr *sh = (void*)(s - (sizeof(struct sdshdr)));
	size_t newlen, len = sdslen(s);

	if (len == 0) return s;
	if (start < 0) {
		start = len + start;
		if (start < 0) start = 0;
	}
	if (end < 0) {
		end = len + end;
		if (end < 0) end = 0;
	}
	newlen = (start > end) ? 0 : (end - start) + 1;
	if (newlen != 0) {
		if (start >= (signed)len) {
			newlen = 0;
		}
		else if (end >= (signed)len) {
			end = len - 1;
			newlen = (start > end) ? 0 : (end - start) + 1;
		}
	}
	else {
		start = 0;
	}
	if (start && newlen) memmove(sh->buf, sh->buf + start, newlen);
	sh->buf[newlen] = 0;
	sh->free = sh->free + (sh->len - newlen);
	sh->len = newlen;
	return s;
}

void sdstolower(sds s) {
	int len = sdslen(s), j;

	for (j = 0; j < len; j++) s[j] = tolower(s[j]);
}

void sdstoupper(sds s) {
	int len = sdslen(s), j;

	for (j = 0; j < len; j++) s[j] = toupper(s[j]);
}

int sdscmp(sds s1, sds s2) {
	size_t l1, l2, minlen;
	int cmp;

	l1 = sdslen(s1);
	l2 = sdslen(s2);
	minlen = (l1 < l2) ? l1 : l2;
	cmp = memcmp(s1, s2, minlen);
	if (cmp == 0) return l1 - l2;
	return cmp;
}

/* Split 's' with separator in 'sep'. An array
 * of sds strings is returned. *count will be set
 * by reference to the number of tokens returned.
 *
 * On out of memory, zero length string, zero length
 * separator, NULL is returned.
 *
 * Note that 'sep' is able to split a string using
 * a multi-character separator. For example
 * sdssplit("foo_-_bar","_-_"); will return two
 * elements "foo" and "bar".
 *
 * This version of the function is binary-safe but
 * requires length arguments. sdssplit() is just the
 * same function but for zero-terminated strings.
 */
sds *sdssplitlen(char *s, int len, char *sep, int seplen, int *count) {
	int elements = 0, slots = 5, start = 0, j;

	sds *tokens = malloc(sizeof(sds)*slots);
#ifdef SDS_ABORT_ON_OOM
	if (tokens == NULL) sdsOomAbort();
#endif
	if (seplen < 1 || len < 0 || tokens == NULL) return NULL;
	if (len == 0) {
		*count = 0;
		return tokens;
	}
	for (j = 0; j < (len - (seplen - 1)); j++) {
		/* make sure there is room for the next element and the final one */
		if (slots < elements + 2) {
			sds *newtokens;

			slots *= 2;
			newtokens = realloc(tokens, sizeof(sds)*slots);
			if (newtokens == NULL) {
#ifdef SDS_ABORT_ON_OOM
				sdsOomAbort();
#else
				goto cleanup;
#endif
			}
			tokens = newtokens;
		}
		/* search the separator */
		if ((seplen == 1 && *(s + j) == sep[0]) || (memcmp(s + j, sep, seplen) == 0)) {
			tokens[elements] = sdsnewlen(s + start, j - start);
			if (tokens[elements] == NULL) {
#ifdef SDS_ABORT_ON_OOM
				sdsOomAbort();
#else
				goto cleanup;
#endif
			}
			elements++;
			start = j + seplen;
			j = j + seplen - 1; /* skip the separator */
		}
	}
	/* Add the final element. We are sure there is room in the tokens array. */
	tokens[elements] = sdsnewlen(s + start, len - start);
	if (tokens[elements] == NULL) {
#ifdef SDS_ABORT_ON_OOM
		sdsOomAbort();
#else
		goto cleanup;
#endif
	}
	elements++;
	*count = elements;
	return tokens;

#ifndef SDS_ABORT_ON_OOM
	cleanup :
	{
		int i;
		for (i = 0; i < elements; i++) sdsfree(tokens[i]);
		free(tokens);
		return NULL;
	}
#endif
}

void sdsfreesplitres(sds *tokens, int count) {
	if (!tokens) return;
	while (count--)
		sdsfree(tokens[count]);
	free(tokens);
}

sds sdsfromlonglong(long long value) {
	char buf[32], *p;
	unsigned long long v;

	v = (value < 0) ? -value : value;
	p = buf + 31; /* point to the last character */
	do {
		*p-- = '0' + (v % 10);
		v /= 10;
	} while (v);
	if (value < 0) *p-- = '-';
	p++;
	return sdsnewlen(p, 32 - (p - buf));
}

sds sdscatrepr(sds s, char *p, size_t len) {
	s = sdscatlen(s, "\"", 1);
	while (len--) {
		switch (*p) {
		case '\\':
		case '"':
			s = sdscatprintf(s, "\\%c", *p);
			break;
		case '\n': s = sdscatlen(s, "\\n", 1); break;
		case '\r': s = sdscatlen(s, "\\r", 1); break;
		case '\t': s = sdscatlen(s, "\\t", 1); break;
		case '\a': s = sdscatlen(s, "\\a", 1); break;
		case '\b': s = sdscatlen(s, "\\b", 1); break;
		default:
			if (isprint(*p))
				s = sdscatprintf(s, "%c", *p);
			else
				s = sdscatprintf(s, "\\x%02x", (unsigned char)*p);
			break;
		}
		p++;
	}
	return sdscatlen(s, "\"", 1);
}

/* Split a line into arguments, where every argument can be in the
 * following programming-language REPL-alike form:
 *
 * foo bar "newline are supported\n" and "\xff\x00otherstuff"
 *
 * The number of arguments is stored into *argc, and an array
 * of sds is returned. The caller should sdsfree() all the returned
 * strings and finally free() the array itself.
 *
 * Note that sdscatrepr() is able to convert back a string into
 * a quoted string in the same format sdssplitargs() is able to parse.
 */
sds *sdssplitargs(char *line, int *argc) {
	char *p = line;
	char *current = NULL;
	char **vector = NULL;

	*argc = 0;
	while (1) {
		/* skip blanks */
		while (*p && isspace(*p)) p++;
		if (*p) {
			/* get a token */
			int inq = 0; /* set to 1 if we are in "quotes" */
			int done = 0;

			if (current == NULL) current = sdsempty();
			while (!done) {
				if (inq) {
					if (*p == '\\' && *(p + 1)) {
						char c;

						p++;
						switch (*p) {
						case 'n': c = '\n'; break;
						case 'r': c = '\r'; break;
						case 't': c = '\t'; break;
						case 'b': c = '\b'; break;
						case 'a': c = '\a'; break;
						default: c = *p; break;
						}
						current = sdscatlen(current, &c, 1);
					}
					else if (*p == '"') {
						/* closing quote must be followed by a space */
						if (*(p + 1) && !isspace(*(p + 1))) goto err;
						done = 1;
					}
					else if (!*p) {
						/* unterminated quotes */
						goto err;
					}
					else {
						current = sdscatlen(current, p, 1);
					}
				}
				else {
					switch (*p) {
					case ' ':
					case '\n':
					case '\r':
					case '\t':
					case '\0':
						done = 1;
						break;
					case '"':
						inq = 1;
						break;
					default:
						current = sdscatlen(current, p, 1);
						break;
					}
				}
				if (*p) p++;
			}
			/* add the token to the vector */
			vector = realloc(vector, ((*argc) + 1) * sizeof(char*));
			vector[*argc] = current;
			(*argc)++;
			current = NULL;
		}
		else {
			return vector;
		}
	}

err:
	while ((*argc)--)
		sdsfree(vector[*argc]);
	free(vector);
	if (current) sdsfree(current);
	return NULL;
}

#ifdef SDS_TEST_MAIN
#include <stdio.h>

int __failed_tests = 0;
int __test_num = 0;
#define test_cond(descr,_c) do { \
    __test_num++; printf("%d - %s: ", __test_num, descr); \
    if(_c) printf("PASSED\n"); else {printf("FAILED\n"); __failed_tests++;} \
} while(0);
#define test_report() do { \
    printf("%d tests, %d passed, %d failed\n", __test_num, \
                    __test_num-__failed_tests, __failed_tests); \
    if (__failed_tests) { \
        printf("=== WARNING === We have failed tests here...\n"); \
    } \
} while(0);

int main(void) {
	{
		sds x = sdsnew("foo"), y;

		test_cond("Create a string and obtain the length",
			sdslen(x) == 3 && memcmp(x, "foo\0", 4) == 0)

			sdsfree(x);
		x = sdsnewlen("foo", 2);
		test_cond("Create a string with specified length",
			sdslen(x) == 2 && memcmp(x, "fo\0", 3) == 0)

			x = sdscat(x, "bar");
		test_cond("Strings concatenation",
			sdslen(x) == 5 && memcmp(x, "fobar\0", 6) == 0);

		x = sdscpy(x, "a");
		test_cond("sdscpy() against an originally longer string",
			sdslen(x) == 1 && memcmp(x, "a\0", 2) == 0)

			x = sdscpy(x, "xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk");
		test_cond("sdscpy() against an originally shorter string",
			sdslen(x) == 33 &&
			memcmp(x, "xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk\0", 33) == 0)

			sdsfree(x);
		x = sdscatprintf(sdsempty(), "%d", 123);
		test_cond("sdscatprintf() seems working in the base case",
			sdslen(x) == 3 && memcmp(x, "123\0", 4) == 0)

			sdsfree(x);
		x = sdstrim(sdsnew("xxciaoyyy"), "xy");
		test_cond("sdstrim() correctly trims characters",
			sdslen(x) == 4 && memcmp(x, "ciao\0", 5) == 0)

			y = sdsrange(sdsdup(x), 1, 1);
		test_cond("sdsrange(...,1,1)",
			sdslen(y) == 1 && memcmp(y, "i\0", 2) == 0)

			sdsfree(y);
		y = sdsrange(sdsdup(x), 1, -1);
		test_cond("sdsrange(...,1,-1)",
			sdslen(y) == 3 && memcmp(y, "iao\0", 4) == 0)

			sdsfree(y);
		y = sdsrange(sdsdup(x), -2, -1);
		test_cond("sdsrange(...,-2,-1)",
			sdslen(y) == 2 && memcmp(y, "ao\0", 3) == 0)

			sdsfree(y);
		y = sdsrange(sdsdup(x), 2, 1);
		test_cond("sdsrange(...,2,1)",
			sdslen(y) == 0 && memcmp(y, "\0", 1) == 0)

			sdsfree(y);
		y = sdsrange(sdsdup(x), 1, 100);
		test_cond("sdsrange(...,1,100)",
			sdslen(y) == 3 && memcmp(y, "iao\0", 4) == 0)

			sdsfree(y);
		y = sdsrange(sdsdup(x), 100, 100);
		test_cond("sdsrange(...,100,100)",
			sdslen(y) == 0 && memcmp(y, "\0", 1) == 0)

			sdsfree(y);
		sdsfree(x);
		x = sdsnew("foo");
		y = sdsnew("foa");
		test_cond("sdscmp(foo,foa)", sdscmp(x, y) > 0)

			sdsfree(y);
		sdsfree(x);
		x = sdsnew("bar");
		y = sdsnew("bar");
		test_cond("sdscmp(bar,bar)", sdscmp(x, y) == 0)

			sdsfree(y);
		sdsfree(x);
		x = sdsnew("aar");
		y = sdsnew("bar");
		test_cond("sdscmp(bar,bar)", sdscmp(x, y) < 0)
	}
	test_report()
}
#endif
